The other set you are talking about are the BBS RZ wheels -no split rims.
I had a brand new set that i never fitted cause the off set was made them a little tight of the car.

But the Spilts rims for the rs500/3door e.g. 7x16 front and 8 x 16 rears are perfect. I brought my splits set from Holland and sent them back to BBS for rebuild. I know i had the last outer rims from BBS for the for the rears, this was about 2 years ago.